Cain was orphaned then adopted by abusive racists who killed his older brother, and Abel's family burned to death. I'm sorry you don't think they've been through enough.
I guess I just don't understand why you're commenting as if the game doesn't make it clear who these characters are. No one here is a fully "good" person, and I am willing to bet Florian has his own share of skeletons in the closet. I just hope you're not upset when it turns out that he's just as fucked up as the other two. The story isn't even halfway over yet afaik from the youtube interview, so we'll see.